buane hull



T UniTEn ST TES- PATENT OF A f DUANE HULL, or NEWBURG, New-Yours IMPROVEMENTMIN Extmcrme TURPENTINE AND OTHER PRODUCTS FROMRESI'NOUSWOODS.

Specification forming part of Letters Patent No. 45,406, dated June 27, 1865.

l To all whom it may concern;

Be it known that .I, DUANE HULL, of New.

. burg, in the county of Orange'and State of New York, have made a new and useful Im proveiu ent iuExtractin g Spirits of Turpent inc and other Products from Pine VVood'and other r Resinous Woods; and Ihe'reby declarethat the following is a full and exact description ofthe same. J 1

This inyentioil consists in efl'ecting the distillation of the wood under a pressure'less than that of "the ordinary atmospheric pressure; 1 t and I accomplish this by means of an air-pump, or other suitable device, applied so as to exhaustor draw oft the air and rapors from the wood during the processofdistillation."'

In a patent issued to me bearing date September: 20, 1864, I have described a process" for obtaining spirits of turpentine and other' products from pine Wood. One of the difiicul tiesatten ding theapplication of that process z in practice is to keep the temperature from rising at times so as to destroy the turpentine 1 and other products'existi-ng in thewood.

Referring to the specification of. my patent" above mentioned for the general principles in yolved in obtaining useful products from resinous woods, the followingdescription will enable personsskilled in the art to apply this my inventioh'gij- The wood should be prepared in the manner well known to those skilled in distilling pine v,wood'to obtain turpentine, rosin, &c., and introduced into any suitable retort or still, such:

as is commonly used for distilling wood, coal,

80c. Heat should' the'n be applied by any suitable heating device, so as to raise the temperature to the point of distillation. Before the -itemperatu're reaches this point an air-pump or other suitable device for drawing-oii' the vepors from the still-or. retort should be put in operation so asto draw oft' the air and vapors from the inside of the stiller ret0rt,-aI ;1-thus eep the pressure inside below that ot 't he'atmospheric. pressure. The efiect of relieving V the pressure in this manneristo cause the va-- f pops of turpentine and other aporizabie products to leave the wood at a lower temperature than they would it the pressure were not removed. Destructive distillation is thereby preventedand a larger yield of valuableproducts is. obtained from tho'woodr I A i l The necessary heat to efl'ectdistillatioiimay be appliedeithcr by means of any suitable furnace under the retort or still, or StCilllTOI hot-air may be used as the medium of heat,- either passed directly into the retort .or still, 'or applied in a jacket or space around the retort or still. Iprcfer using superheated steam. This i let into theiretort or sum u just sufficientquantity. to' keep the temperature within up to the yaporizing point ot' -the product to be drawn off. it is best to have the still incused in some i good non-conductin g 'm'hterial, so as to prevent any llo'ss ot' heat. "The vapors as drawn ofti'.

from the stillare caused to pass through any suitable condenser in which they will be condensed andcollected inthe bottom of the con- .jdcnser, whilefthe uncondensable gases will pass off eitherjintothe open atmosphere or'into' a suitable apparatus for burning them. The

condensed products-"may be drawn oft as often as deemed desirable.

Instead of using steam in thestill water may t be placed in the still with the wood and then vaporized by the application of heat.

vI do not claim the use of steam for distilling wood-g nor do I claim, broadly, distilling with exhaustion or under reduced pressure; but,

Having described my invention andtheseveral modes iu vhich- I propose to carry it into efi'ect, what I claim, and desire to secureby Letters Patent of they United States, is-

The distillation of pine or other resinous wood for the purpose of obtaining spirits of turpentine or other products, underrednced pressure or pressure loss than that of the atmosphere, substantially as herein set forth and described. Q DUANE HULL.

.Witnesses: Jonu'S. HOLLiNGSHEAD, EB. OULVER. 1 

